如果工人人数下降，每个工人的产量必须增加至维持相同生产力水平。

If the number of workers drops, output per worker has to rise to maintain the same level of production.

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由于机械化，每个工人的生产量有了提高。

An improvement of output per worker has been achieved, due to mechanization.

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1980-2004年间，非洲每个农业工人的农业产量是全球最低的，每一年增加不足1%，而在东亚和中东则跨越3%。

There, agricultural output per farmworker was the lowest in the world during 1980-2004, growing by less than 1% a year, compared with over 3% a year in East Asia and the Middle East.

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